In your other connected SQLPlus session, keep an eye on the balance of connections. At the same time, open a new shell session and run this script which will open 160 connections to the database.
a=160; while [ $a -gt 0 ]; do sqlplus sh/sh@RAC & a=$((a-1))done
How were the connections distributed between the database instances during client-side load balancing?

Note: In 11.2 these connections are load balanced across the SCAN listeners instead of the RAC nodes.

Terminate all of the sqlplus sessions by running these two commands. After you run the second command, press <Ctrl-C> after you start seeing the message "no more job".
killall sqlpluswhile true; do fg; done<Ctrl-C>